I have a few Stihl gas saws and love them. Year before last I was in the market for a light top handle saw for in-tree work, limbing, etc. and went with the battery operated MS 161T. It is an amazing little machine. In hindsight I would have gone for a smaller/lighter battery. I went with the AP300 which is waaaaay more capacity than I need. I've limbed and topped a handful of full sized cottonwoods and have never used more than 25% of the battery having made hundreds of cuts.
The single handed operation and not having to pull start the machine between cuts or adjustments in the tree is super convenient, safer, and more efficient. I think electric is definitely the way to go for certain applications, not everything that is for sure. For camp firewood and/or camping and hunting applications I think they are perfect. The lack of engine noise seems pretty advantageous for a number of applications as well.
The battery saws definitely take some getting used to. I have to remind myself not to toggle the trigger while I am walking around with it in my hand like I had gotten used to doing with my gas saws. A bad habit I didn't even realize I'd formed that doesn't carry over well to the battery saws...
The only thing I would change on the 161 is third button they added, as compared to gas saws, that you have to press with your thumb to make it go. It is hard to actuate using your left hand and I find myself wanted to switch cutting hands quite often in the tree. I plan to try and either remove this button or permanently tape it down so the actuation is the same as the gas saws.